package com.rain.example.verifyPermissions.security;

import com.rain.example.verifyPermissions.constants.Constants;
import com.rain.example.verifyPermissions.models.user.User;
import com.rain.example.verifyPermissions.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.authentication.AuthenticationProvider;
import org.springframework.security.authentication.BadCredentialsException;
import org.springframework.security.authentication.LockedException;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.AuthenticationException;
import org.springframework.security.core.userdetails.UsernameNotFoundException;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.stereotype.Component;

import java.util.Objects;

@Component
public class UserAuthenticationProvider implements AuthenticationProvider {
    @Autowired
    private UserService userService;

    @Override
    public Authentication authenticate(Authentication authentication) throws AuthenticationException {
        // 获取表单输入中返回的用户名
        User user = (User) authentication.getPrincipal();
        // 获取表单中输入的密码
        String password = (String) authentication.getCredentials();
        // 查询用户是否存在
        User userInfo = userService.loadUserByUsername(user.getLoginName());
        if (userInfo == null) {
            throw new UsernameNotFoundException("用户名不存在");
        }
        // 还要判断密码是否正确，这里我们的密码使用BCryptPasswordEncoder进行加密的
        if (!password.equals(userInfo.getPassword())) {
            throw new BadCredentialsException("密码不正确");
        }
        // 还可以加一些其他信息的判断，比如用户账号已停用等判断
        if (Objects.equals(Constants.INT_ONE, userInfo.getDeleteFlag())) {
            throw new LockedException("该用户已被冻结");
        }
        // 进行登录
        return new UsernamePasswordAuthenticationToken(userInfo, password);
    }

    @Override
    public boolean supports(Class<?> authentication) {
        return true;
    }
}